diff --git a/pkgs/applications/networking/mailreaders/sup/default.nix b/pkgs/applications/networking/mailreaders/sup/default.nix
index 8efda554d73..b86579673ab 100644
--- a/pkgs/applications/networking/mailreaders/sup/default.nix
+++ b/pkgs/applications/networking/mailreaders/sup/default.nix
@@ -30,6 +30,7 @@ stdenv.mkDerivation rec {
 
   buildPhase = ''
     # the builder uses git to get a listing of the files
+    export EMAIL="nobody@in.here"
     git init >/dev/null
     git add .
     git commit -m "message" >/dev/null